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Garp
Asked:2024-06-02 17:37:31 +0000 UTC2024-06-02 17:37:31 +0000 UTC

更改 QPainter 对象的颜色

  • 772

中画了几个圆圈（按钮）QPainter。
我们需要能够单独更改其中任何一个的颜色。

在这个玩具版本中，颜色变化是通过按下相应的热键引起的。

import sys
from PySide6.QtWidgets import *
from PySide6.QtCore import *
from PySide6.QtGui import *


class Main(QWidget):
    def __init__(self, parent=None):
        super(Main, self).__init__(parent)
        self.state_button_1 = 0
        self.state_button_2 = 0
        self.state_button_3 = 0

def paintEvent(self, event):
    painter = QPainter(self)
    painter.setRenderHint(QPainter.Antialiasing, True)
    painter.setPen(QPen(Qt.black, 2, Qt.SolidLine))
    painter.setBrush(QBrush(Qt.red, Qt.SolidPattern))
    painter.drawEllipse(50, 50, 20, 20)
    painter.drawEllipse(30, 70, 20, 20)
    painter.drawEllipse(70, 70, 20, 20)

def keyPressEvent(self, keyEvent):
    key = keyEvent.key()
    if key == Qt.Key_Q:
        if self.state_button_1:
            # меняем цвет кнопки  (50, 50) на зелёный
            self.state_button_1 = 0
            print('кнопка 1 зелёная')
        else:
            # меняем цвет кнопки  (50, 50) на красный
            self.state_button_1 = 1
            print('кнопка 1 красная')
    elif key == Qt.Key_W:
        if self.state_button_2:
            # меняем цвет кнопки  (30,70) на зелёный
            self.state_button_2 = 0
            print('кнопка 2 зелёная')
        else:
            # меняем цвет кнопки  (30,70) на красный
            self.state_button_2 = 1
            print('кнопка 2 красная')
    elif key == Qt.Key_E:  
        if self.state_button_3:
            # меняем цвет кнопки  (70, 70) на зелёный
            self.state_button_3 = 0
            print('кнопка 3 зелёная')
        else:
            # меняем цвет кнопки  (70, 70) на красный
            self.state_button_3 = 1
            print('кнопка 3 красная')


if __name__ == '__main__':
    app = QApplication(sys.argv)
    w = Main()
    w.show()
    sys.exit(app.exec())
python

1 个回答

  1. Best Answer

    尝试这个：

    import sys
'''
from PySide6.QtWidgets import *
from PySide6.QtCore import *
from PySide6.QtGui import *
'''
from PyQt5.Qt import *


class Main(QWidget):
    def __init__(self, parent=None):
        super(Main, self).__init__(parent)
        
        self.button_1 = QPushButton(self)
        self.button_1.move(50, 50)
        self.button_1.setCheckable(True)
        self.button_2 = QPushButton(self)
        self.button_2.move(30, 70)
        self.button_2.setCheckable(True)
        self.button_3 = QPushButton(self)
        self.button_3.move(70, 70)
        self.button_3.setCheckable(True)

    def keyPressEvent(self, keyEvent):
        key = keyEvent.key()
        if key == Qt.Key_Q:
            self.button_1.click()
        elif key == Qt.Key_W:
            self.button_2.click()
        elif key == Qt.Key_E:  
            self.button_3.click()


StyleSheet = '''
QPushButton {
    min-width:  17px;
    max-width:  17px;
    min-height: 17px;
    max-height: 17px;
    border: 2px solid #191970;
    border-radius: 10px;        
    background-color: #FF0000;     
}    
QPushButton:hover {
    background-color: #f55; 
} 
QPushButton:checked {
    background-color: #00FF7F; 
} 
QPushButton:checked:hover {
    background-color: #77FF33; 
}    
'''


if __name__ == '__main__':
    app = QApplication(sys.argv)
    app.setStyleSheet(StyleSheet)
    w = Main()
    w.show()
    sys.exit(app.exec())

    在此输入图像描述

    更新

    不幸的是，不需要，你只需要画球即可。
    我需要提供一个接近真实的代码，而不是完全像玩具一样。

    paintEvent()在- painter.drawEllipse(), - 方法中创建的对象painter.drawRect可以作为单独的小部件进行访问吗？

    我不太明白你的实现，嗯，这是必要的——这是必要的。

    import sys
from PyQt5.Qt import *


class Main(QWidget):
    def __init__(self, parent=None):
        super(Main, self).__init__(parent)
        
        self.state_button_1 = 0
        self.state_button_2 = 0
        self.state_button_3 = 0
        
        self.color_red = "#FF0000"                                   # +++
        self.color_green = "#00FF7F"                                 # +++

    def paintEvent(self, event):
        painter = QPainter(self)
        painter.setRenderHint(QPainter.Antialiasing, True)
        painter.setPen(QPen(Qt.black, 2, Qt.SolidLine))
        
#        painter.setBrush(QBrush(Qt.red, Qt.SolidPattern))
# +++ vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv       
        if self.state_button_1:
            painter.setBrush(QBrush(QColor(self.color_green)))
        else:
            painter.setBrush(QBrush(QColor(self.color_red)))        
        painter.drawEllipse(50, 50, 20, 20)
        if self.state_button_2:
            painter.setBrush(QBrush(QColor(self.color_green)))
        else:
            painter.setBrush(QBrush(QColor(self.color_red)))         
        painter.drawEllipse(30, 70, 20, 20)
        if self.state_button_3:
            painter.setBrush(QBrush(QColor(self.color_green)))
        else:
            painter.setBrush(QBrush(QColor(self.color_red))) 
        painter.drawEllipse(70, 70, 20, 20)
# +++ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

    def keyPressEvent(self, keyEvent):
        key = keyEvent.key()
        if key == Qt.Key_Q:
            if self.state_button_1:
                # меняем цвет кнопки  (50, 50) на зелёный
                self.state_button_1 = 0
                print('кнопка 1 красная')
            else:
                # меняем цвет кнопки  (50, 50) на красный
                self.state_button_1 = 1
                print('кнопка 1 зелёная')
            self.update()                                            # +++
        elif key == Qt.Key_W:
            if self.state_button_2:
                # меняем цвет кнопки  (30,70) на зелёный
                self.state_button_2 = 0
                print('кнопка 2 красная')
            else:
                # меняем цвет кнопки  (30,70) на красный
                self.state_button_2 = 1
                print('кнопка 2 зелёная')
            self.update()                                            # +++
        elif key == Qt.Key_E:  
            if self.state_button_3:
                # меняем цвет кнопки  (70, 70) на зелёный
                self.state_button_3 = 0
                print('кнопка 3 красная')
            else:
                # меняем цвет кнопки  (70, 70) на красный
                self.state_button_3 = 1
                print('кнопка 3 зелёная')
            self.update()                                            # +++


if __name__ == '__main__':
    app = QApplication(sys.argv)
    w = Main()
    w.show()
    sys.exit(app.exec())

    在此输入图像描述

    • 2

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